Improvement in safety-valves



H. S. )EWELL &F. STEELE.

n Improvemenfin. Safety Valves. Ne., 123,176.

Patented Jan. 30, 1872: .Y

QL'gJ.

UNITED STATES PATENT OEEICE.

HERBERT S. JEVELL AND FERDINAND STEELE, OF BROOKLYN, NEW YORK.

IMPROVEMENT IN SAFETY-VALVES.

Specification forming part of Letters Patent No. 123,176, dated January30, 1872.

Specification describing a new and Improved Safety-Valve and Alarm,invented by HER- BERT S. JEWELL and FERmNAND STEELE, of Brooklyn, in thecounty oi' Kings and State of New York.

Figure l is a vertical, and Fig. 2 a horizontal section of my improvedsafety-valve.n

The invention will first be fully described and then clearly pointed outin claim.

A in the drawing represents the valve-chamber, of cylindrical or otherform.v lts lower end is connected with the steam-pipe B, that projectsfrom the boiler. O is the valve, placed Within the chamber, and soshaped at the lower end as to nicely t its seat a at the upper end ofthepipe B. D is the alarm-whistle or instrument placed on the top ofthechamber A. The valve is smaller in diameter than the interior ot' thechamber A, and has three or more projecting ribs, b b. Between the ribsb are spaces d d, in which the steam can ascend to the whistle DWhenever the valveis open. The valve is made of a certain weight, to beraised only when a certain allowed degree of pressure in the boiler isexceeded. 1t may receive sectional or removable Weights, to be therebyregulated with exactness. Upon its top is placed a Weight, E, whichrests loose. On the upper surface ofthe weight E are sliding bolts e e,which are by springs ff crowded against the periphery ofthe chamber A.When by an excess oi' pressure the valve is raised sniiiciently high tobring the bolts e e in line with an inner groove, g, or catch in thechamber A, the bolts will by their spring f be thrown into the groove orcatch g and hold the Weight E suspended. This will relieve the valvefrom the weight E and reduce the pressure capacity. of the boiler. Thebolts e and spring f may, ii' desired, be applied to the valve direct tohold it bodily suspended when once elevated. Thus, for example, when aninspector has ascertained that a certain boiler can with safety onlycarry, say, thirty pounds of steam pressure, he will regulate the weightof valve C accordingly, and lock the chamber A. 1f the engineer bynegligence permits the pressure to exceed thirty pounds the valve willbe raised and the whistle blown. Immediate steps to reduce pressure willrestore the valve toits former position; but if the excess of pressureis continued the valve will be elevated su-A ciently high to bring thebolts c in line with the groove g with stated eti'ect. Then either theentire valve will be held elevated and the alarm continuously sounded,or, at least, -the weight E will be detached, and, say five or tenpounds, deducted from the pressure to be car- Orooves g, combined withvalve G, having4

